细述搭建docker之点到点的容器网络

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查看目前的网络环境

[root@liuxin-test01 ~]# ip a
1: lo: mtu 65536 qdisc noqueue state UNKNOWN qlen 1
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: mtu 1500 qdisc pfifo_fast state UP qlen 1000
link/ether 00:0c:29:ca:41:84 brd ff:ff:ff:ff:ff:ff
inet 192.168.8.192/24 brd 192.168.8.255 scope global eth0
valid_lft forever preferred_lft forever
inet6 fe80::20c:29ff:feca:4184/64 scope link
valid_lft forever preferred_lft forever
3: eth1:
mtu 1500 qdisc noop state DOWN qlen 1000
link/ether 00:0c:29:ca:41:8e brd ff:ff:ff:ff:ff:ff
4: docker0: mtu 1500 qdisc noqueue state DOWN
link/ether 02:42:a3:f4:2f:40 brd ff:ff:ff:ff:ff:ff
inet 172.17.0.1/16 scope global docker0
valid_lft forever preferred_lft forever
inet6 fe80::42:a3ff:fef4:2f40/64 scope link
valid_lft forever preferred_lft forever

创建两个无网络的容器

 

下面两个容器是在两个终端中创建的

[root@liuxin-test01 ~]# docker run --rm -it --net=none --name='centos01' centos:7.4.1708
[root@f64cdc7ffff1 /]#
[root@liuxin-test01 ~]# docker run --rm -it --net=none --name='centos02' centos:7.4.1708
[root@cd4df383b68e /]#

查看这两个容器的进程ID

[root@liuxin-test01 ~]# docker inspect -f '{{.State.Pid}}' f64
21682
[root@liuxin-test01 ~]# docker inspect -f '{{.State.Pid}}' cd4
21832

为这两个容器创建虚拟的网络空间

[root@liuxin-test01 ~]# mkdir -p /var/run/netns
[root@liuxin-test01 ~]# ln -s /proc/21682/ns/net /var/run/netns/21682
[root@liuxin-test01 ~]# ln -s /proc/21832/ns/net /var/run/netns/21832
[root@liuxin-test01 ~]#

创建一对veth,两端命名为A、B

veth 是虚拟的以太设备,类似于网卡设备。这个是linux容器技术引进的,要求必须成对出现

[root@liuxin-test01 ~]# ip link add A type veth peer name B
[root@liuxin-test01 ~]# ip a
1: lo: mtu 65536 qdisc noqueue state UNKNOWN qlen 1
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: mtu 1500 qdisc pfifo_fast state UP qlen 1000
link/ether 00:0c:29:ca:41:84 brd ff:ff:ff:ff:ff:ff
inet 192.168.8.192/24 brd 192.168.8.255 scope global eth0
valid_lft forever preferred_lft forever
inet6 fe80::20c:29ff:feca:4184/64 scope link
valid_lft forever preferred_lft forever
3: eth1:
mtu 1500 qdisc noop state DOWN qlen 1000
link/ether 00:0c:29:ca:41:8e brd ff:ff:ff:ff:ff:ff
4: docker0: mtu 1500 qdisc noqueue state DOWN
link/ether 02:42:a3:f4:2f:40 brd ff:ff:ff:ff:ff:ff
inet 172.17.0.1/16 scope global docker0
valid_lft forever preferred_lft forever
inet6 fe80::42:a3ff:fef4:2f40/64 scope link
valid_lft forever preferred_lft forever
157: B@A: mtu 1500 qdisc noop state DOWN qlen 1000
link/ether de:f7:3b:24:a5:0e brd ff:ff:ff:ff:ff:ff
158: A@B:
mtu 1500 qdisc noop state DOWN qlen 1000
link/ether 9a:65:96:de:04:90 brd ff:ff:ff:ff:ff:ff

将两端分别放到两个容器中

我们可以看到,加入到容器之后,再次执行ip a 已经看不到这两个设备了

[root@liuxin-test01 ~]# ip link set A netns 21682
[root@liuxin-test01 ~]# ip link set B netns 21832
[root@liuxin-test01 ~]# ip a
1: lo: mtu 65536 qdisc noqueue state UNKNOWN qlen 1
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: mtu 1500 qdisc pfifo_fast state UP qlen 1000
link/ether 00:0c:29:ca:41:84 brd ff:ff:ff:ff:ff:ff
inet 192.168.8.192/24 brd 192.168.8.255 scope global eth0
valid_lft forever preferred_lft forever
inet6 fe80::20c:29ff:feca:4184/64 scope link
valid_lft forever preferred_lft forever
3: eth1:
mtu 1500 qdisc noop state DOWN qlen 1000
link/ether 00:0c:29:ca:41:8e brd ff:ff:ff:ff:ff:ff
4: docker0: mtu 1500 qdisc noqueue state DOWN
link/ether 02:42:a3:f4:2f:40 brd ff:ff:ff:ff:ff:ff
inet 172.17.0.1/16 scope global docker0
valid_lft forever preferred_lft forever
inet6 fe80::42:a3ff:fef4:2f40/64 scope link
valid_lft forever preferred_lft forever

设置两个容器网络空间的ip

[root@liuxin-test01 ~]# ip netns exec 21682 ip addr add 192.168.99.1/32 dev A
[root@liuxin-test01 ~]# ip netns exec 21832 ip addr add 192.168.99.2/32 dev B

启动两个容器的网络

[root@liuxin-test01 ~]# ip netns exec 21682 ip link set A up
[root@liuxin-test01 ~]# ip netns exec 21832 ip link set B up

给这两个容器设置一下网关

[root@liuxin-test01 ~]# ip netns exec 21682 ip route add 192.168.99.2/32 dev A
[root@liuxin-test01 ~]# ip netns exec 21832 ip route add 192.168.99.1/32 dev B

测试

[root@f64cdc7ffff1 /]# ping 192.168.99.2
PING 192.168.99.2 (192.168.99.2) 56(84) bytes of data.
64 bytes from 192.168.99.2: icmp_seq=1 ttl=64 time=0.095 ms
[root@cd4df383b68e /]# ping 192.168.99.1
PING 192.168.99.1 (192.168.99.1) 56(84) bytes of data.
64 bytes from 192.168.99.1: icmp_seq=1 ttl=64 time=0.057 ms

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